直升机燃气涡轮发动机的机械功大部分消耗于（）。

The indicated airspeed of a stall varies with （ ） ．

An airplane stalls when （ ） , regardless of weight or airspeed.

The way to recover from a stall is to （ ） ．

The occurrence of a stall is directly related to （ ） ．

A stall will normally result in a rapid decrease in （ ） ．

A stall is caused by the separation of airflow （ ） ．

The coefficient of lift is a way to measure lift as it relates to the （ ） ．

Anytime the pilot moves the control column fore or aft during flight, he changes （ ） ．

The two primary ways to control lift are changing （ ） ．

Angle of incidence is the angle between the chord line and a line parallel to the （ ）. This angle cannot be controlled.